[Bug tree-optimization/123126] [16 Regression] 6-10% slowdown of xalancbmk_r on Zen{4,5} since r16-6104-gb5c64db0a49d46 with PGO

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123126

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |hubicka at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
And -fprofile-partial-training helps a lot (15%) and resolves the regression. 
I wonder if that should be enabled by default?  It might also explain why
probably_never_executed_edge_p makes a difference here.

IMO this is a non-bug and -fprofile-use should imply
-fprofile-partial-training?